Open the Search and replace window with Ctrl+K and enter the word or expression you wish to replace in the Search for box.
Then click on Search button to display all the corresponding occurrences.
Enter the new word or phrase (regular expressions are not supported) in the Replace with box, then click one of the following options:
Replace All: operates replacement of all occurrences (after displaying a confirmation window where the number of occurrences is shown).
Replace: operates a "one by one" replacement, by the mean of buttons in the header of the Editor pane. Click Replace Next or Skip, then end the replacement session with Finish.
Close: close the window without any change.
Search options are similar to the ones displayed in Search window.
Except one: check Untranslated in order to operate Search and replace also on segments that have not been translated yet.
To make it possible (although Search and replace operates only on memory), OmegaT will copy the source segment to the target segment before the replace operation occurs. If no replacement is done to a given segment, the target segment will be “emptied”, i.e., it will remain untranslated.